html {
	width: 100%;
	height: 100%;
}

body {
	height: 100%;
}

.lecture_bg {
	width: 100%;
	height: 100%;
	background: url("../../images/classroom/lecture_bg.png") no-repeat;
	-webkit-background-size: 100% 100%;
	background-size: 100% 100%;
}

.lecture_flag {
	width: 258px;
	height: 161px;
	background: url("../../images/classroom/lecture_flag.png") no-repeat;
	position: fixed;
	left: 0px;
	top: 0px;
	z-index: 100;
}

.lecture_title {
	width: 758px;
	height: 107px;
	background: url("../../images/classroom/lecture_title.png") no-repeat;
	position: fixed;
	left: 300px;
	top: 0px;	
}

.lecture_back {
	width: 74px;
	height: 74px;
	background: url("../../images/classroom/lecture_back.png") no-repeat;
	position: fixed;
	right: 20px;
	top: 20px;
	z-index: 999;
}

.lecture_grade {
	width: 279px;
	height: 44px;
	background: url("../../images/classroom/lecture_grade.png") no-repeat;
	position: fixed;
	left: 200px;
	top: 100px;
	font-family: "楷体","楷体_GB2312";
	text-align: center;
	font-size: 22px;
	line-height: 40px;
}

.lecture_bottom {
	width: 1016px;
	height: 99px;
	background: url("../../images/classroom/lecture_bottom.png") no-repeat;
	margin-top: -99px;
	margin-left: auto;
	margin-right: auto;
}

.content_slelct {
	width: 1005px;
	height: 338px;
	font-weight: bold;
}

.content_slelct .simulate {
	width: 286px;
	height: 251px;
	background: url("../../images/classroom/simulate.png") no-repeat;
	float: left;
	margin-top: 42px;
}

.content_slelct .aoshu {
	width: 429px;
	height: 338px;
	background: url("../../images/classroom/aoshu.png") no-repeat;
	float: left;
}

.content_slelct .error {
	width: 286px;
	height: 251px;
	background: url("../../images/classroom/error.png") no-repeat;
	float: left;
	margin-top: 42px;
}

